Go West!

"Young Naomi leaves the Far East to search the New World for the family she's never known. Her search takes her deep into the West—which is a good thing, because the agitated horse that comes into her possession will only run in that direction!
Things get more twisted when Naomi interrupts a duel between an outlaw and a bounty hunter—and each of them suddenly believes he is related to her. The outlaw thinks Naomi's his sister and the bounty hunter is convinced he's her dad!"

(Source: back cover)

Go West! was published in English by CMX Manga from December 2, 2008 to December 22, 2009.